package cn.tedu.sp06.filter;

import cn.tedu.web.util.JsonResult;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class AccessFilter extends ZuulFilter{
    //pre, routing, post, error
    @Override
    public String filterType() {
//        return "pre";前置过滤器
        return FilterConstants.PRE_TYPE;
    }
    //过滤器的顺序号
    @Override
    public int filterOrder() {
        //有五个默认的过滤器,自己的过滤器加到末尾
        //在第五个过滤器中,向Context对象放入了 serviceId
        //后面的组件才能访问这个数据
        return 6;
    }

    //针对当前请求,判断是否要执行过滤代码
    //如果调用 item-service 检查是否登录
    //否则,不检查登录,直接访问
    @Override
    public boolean shouldFilter() {
        //先获取当前请求的上下文对象
        RequestContext ctx = RequestContext.getCurrentContext();
        //当前请求,调用的服务Id
        String serviceId = (String)(ctx.get(FilterConstants.SERVICE_ID_KEY));
        //调用的是否是item-service
        return "item-service".equals(serviceId);
    }
    // 过滤代码
    @Override
    public Object run() throws ZuulException {
        //获取上下文对象
        RequestContext ctx = RequestContext.getCurrentContext();
        //获取request对象
        HttpServletRequest request = ctx.getRequest();
        ///接收token参数
        String token = request.getParameter("token");
        //如果没有token,阻止继续调用,直接返回响应
        if (StringUtils.isBlank(token)){
            //阻止继续调用
            ctx.setSendZuulResponse(false);
            //直接返回响应
            ctx.addZuulResponseHeader("Content-Type","application/json;charset=UTF-8");
            ctx.setResponseBody(JsonResult
                    .err()
                    .code(400)
                    .msg("Not login! 未登录")
                    .toString());
        }
        return null;
    }
}
